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M12
Quectel M12 User Manual
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M12 Hardware Design
M12_Hardware_Design_V3.3
-
48 -
SPK1P
SPK1N
Differential layout
Amplifier
circuit
Module
10pF
0603
Close to speaker
GND
ESD
33pF
0603
33pF
0603
GND
10pF
0603
ESD
10pF
0603
33pF
0603
Figure
29
:
Reference design with an amplifier for AOUT1
T
exas Instruments TP
A6205A1 is recommended for a suitable differential audio am
plifier
. There
are plenty of excellent audio amplifiers in the market.
SPK2P
AGND
Differential layout
Module
22uF
Close to speaker
GND
ESD
33pF
0603
10pF
0603
Figure
30
:
Reference design for AOUT2
Quectel
Confidential
48
50
Table of Contents
Default Chapter
3
Table of Contents
3
Revision History
8
1 Introduction
9
Related Documents
9
Terms and Abbreviations
10
Safety Cautions
12
2 Product Concept
14
Key Features
14
Functional Diagram
16
Evaluation Board
17
3 Application Interface
18
Pins of Module
18
Pin Assignment
18
Pin Description
19
Operating Modes
24
Power Supply
26
Power Features of Module
26
Decrease Supply Voltage Drop
26
Reference Design for Power Supply
27
Monitor Power Supply
28
Power up and Power down Scenarios
28
Power on Module Using PWRKEY Pin
28
Power down
30
Restart Module Using PWRKEY Pin
33
Power Saving
34
Minimum Functionality Mode
35
SLEEP Mode (Slow Clock Mode)
35
Wake up Module from SLEEP Mode
35
C3.6. Summary of State Transitions
36
RTC Backup
36
Serial Interfaces
38
UART Port
39
Debug Port
42
UART3 Port
43
UART Application
44
Audio Interfaces
46
Decrease TDD Noise and Other Noise
47
Microphone Interfaces Configuration
47
Receiver and Speaker Interface Configuration
48
Earphone Interface Configuration
50
SIM Card Interface
51
SIM Card Application
51
SIM Card Holder
53
Adc
55
Behaviors of the RI
56
Network Status Indication
58
Operating Status Indication
59
General Purpose Input & Output (GPIO)
59
SD Card Interface
60
4 Antenna Interface
62
Antenna Installation
62
RF Output Power
63
RF Receiving Sensitivity
63
Operating Frequencies
63
Recommendation of RF Pad Welding
63
5 Electrical, Reliability and Radio Characteristics
65
Absolute Maximum Ratings
65
Operating Temperature
65
Power Supply Ratings
66
Current Consumption
67
Electro-Static Discharge
68
6 Mechanical Dimensions
69
Mechanical Dimensions of the Module
69
Footprint of Recommendation
71
Top View of the Module
73
Bottom View of the Module
73
Appendix A: GPRS Coding Schemes
74
Appendix B: GPRS Multi-Slot Classes
75
4
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Quectel M12 Specifications
General
Brand
Quectel
Model
M12
Category
Control Unit
Language
English
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